By default, After you created a project in Microsoft Team Foundation Server 2012, “Requirement Categor” only contains “User Story” as its member, then when you attempt to “Add existing requirements to a test plan”, only the “User Story” workitem will be acceptable.

In most case, when there is Change Request issued to the team, QA will need to have test case associated with it as well, which expect to add Change Request as requirement and can be added to a test plan.

We can achieve this by the following steps(need to obtain TFS administration permission first):

Export Work Item Type Categories to a xml file:
run the following command form “Developer Command Prompt for VS2012”: